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Pope Francis has condemned the gas attack in Syria that left more than 70 people dead

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Children get treatment at a hospital after a suspected gas attack

A US government source believes the chemical agent sarin was used in the attack.

I firmly deplore the unacceptable carnage that took place yesterday in Idlib province, where scores of helpless people, including many children, were killed

Pope Francis

Photographs show people breathing through oxygen masks and wearing protection suits, while others carry the bodies of dead children.

Corpses wrapped in blankets have been seen lined up on the ground.

Activists in northern Syria circulated pictures on social media showing a man with foam around his mouth, and rescue workers hosing down almost-naked children squirming on the floor as hospitals overflowed with victims.

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The Syrian military denied responsibility saying it would never use chemical weapons